A practical protocol to obtain 1,1′-binaphthyl-2,2′-diamine was developed from 2-naphthol and 2-naphthylhydrazine under mild conditions： solvent-free, 125-130 ℃, atmospheric pressure. The convenient procedure makes the process amenable for large-scale synthesis of the versatile compound.
Four novel hexadentate imidazolium salts were readily prepared by refluxing hexakis(bromomethyl)benzene with l-substituted imidazoles in THF in 90～96% yields.
